django模板中父子关系的树结构

class TreeNode(models.Model):
    name = models.CharField(max_length=50)
    parent = models.ForeignKey('self', null=True, blank=True, related_name='children')

def view_function(request):
    nodes = TreeNode.objects.all()
    root_nodes = nodes.filter(parent=None)
    return render(request, 'template.html', {'nodes': root_nodes})

{% load my_tags %}
{% recursetree nodes %}
    <div>{{ node.name }}</div>
    {% if node.children %}
        <ul>
            {{ children }}
        </ul>
    {% endif %}
{% endrecursetree %}

from django import template

register = template.Library()

@register.tag(name='recursetree')
def recursetree(parser, token):
    # ...

@register.tag(name='children')
def children(parser, token):
    # ...

{% load my_tags %}
{% recursetree nodes %}
    <div>{{ node.name }}</div>
    {% if node.children %}
        <ul>
            {{ children }}
        </ul>
    {% endif %}
{% endrecursetree %}